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摘要
In this paper, we propose dual track architecture and time synchronous scheme for wavelet reconstruction processor using surface acoustic wave (SAW) device based on multistripe coupler(MSC). An arbitrary scale wavelet reconstruction processor with dual track architecture consists of a wavelet interdigital transducer (IDT) apodized by the envelope of wavelet function, two MSCs, and two reconstruction wavelet IDTs apodized by the envelope of identical reconstruction wavelet function. The SAW launched by wavelet IDT is bidirectional. Two reconstruction wavelet IDTs with identical design parameter are symmetrically deposited on the dual track of wavelet reconstruction processor. Therefore, the performances of wavelet reconstruction processor were improved due to bidirectional SAW received by two reconstruction wavelet IDTs. Furthermore, the delay time characteristic of SAW propagating on crystals substrate surface was skillfully applied to compensate the time asynchronous problem among wavelet reconstruction processor. This means ensures that all scale processors in wavelet reconstruction processor have identical response time. An experiment of wavelet reconstruction processor with dual track architecture and time synchronous scheme was presented. Experimental results confirm that the performances of wavelet reconstruction processor are improved, and time synchronous is realized in this wavelet reconstruction processor with three scales.
